Meet Zak and Jack, a pair of hard-working Hobsters who live in a small village called Monstertown. Famous for their clever inventions, Hobsters enjoy an earthly paradise of lush woods, paved streets and cozy houses. When word of their settlement spreads, the evil beasts of the monster world band together in an envious campaign against the goodhearted Hobsters. Luckily, Zak and Jack learn about the plot and prepare for the assault.